evo.com | Hydro Flask Water Bottles > Many people find that their water bottles become companions, and you can be sure the Hydro Flask 21oz Standard Mouth Water Bottle will become that and more. This brilliant bottle keeps your beverages cold for 24 hours or hot for 6 hours. Perfect for backpack side pocket or your car's cup holder, the Hydro Flask Standard Mouth Water Bottle will go everywhere with you! TempShield(TM) Protected Compatible with Hydro Flip Lid and Wide Straw Lid BPA-Free and Phthalate-Free Durable, Sweat-Free Powder Coat Finish (or Classic Stainless Option) 18/8 Pro Grade Stainless Steel Won't retain or transfer flavor. | Hydro Flask 21oz Standard Mouth Water Bottle 2025 in Blue